“You could do serendipitous searches. So if the telescopes were studying quasars, for example, we could piggy-back off that and analyse the data to look for a different type of signal – not the natural astrophysical signal that the quasar astronomer was interested in, but something in the noise that one might imagine could be associated with aliens. This approach would get you Seti research almost for free,” the Jodrell associate director explained.
“There are billions of planets out there. It would be remiss of us not to at least have half an ear open to any signals that might be being sent to us.”
In addition to eMerlin, the Africa and Australia. It will have incredible power, not only to screen out interference from TV and phone signals here on Earth, but to resolve very faint signals at vast distances. It has been said the SKA could detect an airport radar on an alien world 50 light- Jonathan Amos - BBC News